CVE-2025-64458: Djangoproject Django

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

An issue was discovered in 5.1 before 5.1.14, 4.2 before 4.2.26, and 5.2 before 5.2.8. NFKC normalization in Python is slow on Windows. As a consequence, `django.http.HttpResponseRedirect`, `django.http.HttpResponsePermanentRedirect`, and the shortcut `django.shortcuts.redirect` were subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.

Affected products

• Djangoproject Django: from 4.2, before 4.2.26 (fixed in 4.2.26); from 5.1, before 5.1.14 (fixed in 5.1.14); from 5.2, before 5.2.8 (fixed in 5.2.8)

Published 2025-11-05. Last modified 2026-06-17.